Apparatus for supporting overground wires.



Na. 648,505. Patented May I, I900.

' C. J. KBUNENBERG.

APPARATUS FOR SUPPORTING UVERGROUND WIRES.

(Application filed. Oct. 12, 17.)

(No. Model.)

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UNITED STATES,

PATEN anion.

CARL JUL. KRONENBERG, OF AUFDERHCHE, GERMANY.

APPARATUS FOR SUPPORTING OVERGROUND WERES.

SPECIFICATION forming part of Letters Patent No. 648,501, dated May 1, 1900. Application filed October 12, 1899. $erlal No. 738,419. (No model.)

T0 at whom it may concern.-

Be it known that I, CARL J ULIUs KRONEN- BERG, a subject of the King of Prussia, Emperor of Germany, residing at Aufderhohe, Prussia, Germany, have invented certain new and useful Improvements in Apparatus for Supporting Overground W'ires, of which the following is a specification.

This invention relates to improvements in the construction and arrangement of devices for supporting overhead electric wires.

The improvements are illustrated in the accompanying drawings, which form a part of this application, in which Figure 1 is a cross-section of a metal telegraph-post having my improved cross-arm secured thereto. Fig. 2 is a side elevation of a section of said cross-arm, showing the windholes theret-hrough. Fig. 3 is an end View of said arm with an insulator in position thereon. Fig. 4 is a front elevation, on a large scale, of a section of the cross-arm with the insulator-pin in position. Fig. 5 is a part section and part end view of the parts shown in Fig. l, and Fig. 6 is a bottom plan view of the same.

Referring to the drawings, it will be seen that the cross-arm a is made from flat metal bent in U shape, the web being indicated by (t and the lower flange or portion by a In the center of the cross-arm a depression a is formed by bending the metal at that point, said depression being of the proper size to partially embrace the metal pole b, to which it is secured by means of clamp c, which surrounds the pole, passes through suitable openings in the cross-arm, and is fitted on its ends with nuts 0 and c and a plate-washer d, all as clearly shown in Fig. 1. In the web portion a of the cross-arm a plurality of holes 6 are formed, which serve as passages for the wind or air-currents to which the arm is subjected when in position, thus decreasing the strain on said arm and the fittings by which it is secured to the pole. The flanges of the cross-arm are slotted, as at f, the number of such slots depending upon the number of insulators it is intended to attach to the arm.

The insulators g, which may be-of any desired form, are mounted on a pin 9 in the usual manner. Each pin 9 is formed with an annular shoulder h and a foot 1', which bear,respectively,against the upper and lower flanges of the cross-arm. The upper face of the foot is beveled transversely, as at '6', so that as the pin is rotated on its axis after being inserted in the slots said face will frictionally engage the lower face of the flange a and thus wedge the cross-arm between said foot and the annular shoulder when the foot is in the position shown in Fig. 5. The bearing thus obtained will be sufficient to hold the insulator-pin in position, but at the same time will permit the removal of the said pin when the latter is struck a sharp blow and turned at an angle to its wedged position of about one hundred and eighty degrees.

Having thus described my invention, what I claim as new, and desire to secure byLetters Patent, is-

1. A cross-arm for supporting the insulators of electric wires consisting of a U -shaped iron having recess for receiving a metal pole, the web of said iron having wind-holes therethrough, substantially as described.

2. A device for supporting the insulators of electric wires, comprising a U-shaped iron adapted to be fitted to a pole or post, having wind-holes through the Web, and slots in the flanges thereof, in combination with insulator-pins provided with a shoulder and a foot adapted to embrace said U-shaped iron, as described.

3. In a device for supporting insulators of the character described, an insulator-pin having a shoulder thereon, and a foot at an angle to said pin, the upper face of said portion being beveled, substantially as set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses.

0. JUL. KRONENBERG.

Witnesses:

LUDWIG TUROHHOFF, MAX Lu'rrnns. 

